A disconnect switch disconnects the heater from the power source, and is typically required in building codes. An on/auto fan switch allows you to choose if you want the fan to run continuously or only turn on when the temperature dips. A hi/lo switch allows you to adjust the temperature between high and low, which can help you save energy. The 3-position switch allows you to switch between on, fan, and off. Choose the switch that allows you to use the heat settings that work best for your space.
A relay relays electrical power to the heating elements and blower motor inside the furnace cabinet, and then the heating elements then provide the heat that warms the air, and the blower motor sends warm air through the ductwork.
A transformer transforms electrical energy from one circuit to another, or to multiple circuits, alternating the current from one voltage to another. Transformers take up a lot of space, so choose a relay without a transformer if you need to save space.
King Electric sells many mounting accessories, including:
To wire to a remote thermostat, use a power contactor or a line voltage terminal block.
A single-pole thermostat cannot switch off unless you disconnect the power. When using a heater with a single-pole thermostat, make sure to keep items off the heater surface because the thermostat remains at a low temperature rather instead of shutting off.
A double-pole thermostat can switch on and off. After switching off a double-pole heater, the heater will stay off even if the temperature dips.